Dell PowerConnect B-FCXs Configuration Manual page 322

8
PVST/PVST+ compatibility
Commands on the Dell PowerConnect Device
PowerConnect(config)#vlan-group 1 vlan 2 to 4
PowerConnect(config-vlan-group-1)#tagged ethernet 1/1
PowerConnect(config-vlan-group-1)#exit
PowerConnect(config)#interface ethernet 1/1
PowerConnect(config-if-1/1)#dual-mode
PowerConnect(config-if-1/1)#pvst-mode
These commands configure a VLAN group containing VLANs 2, 3, and 4, add port 1/1 as a tagged
port to the VLANs, and enable the dual-mode feature and PVST+ support on the port. The
dual-mode feature allows the port to send and receive untagged frames for the default VLAN (VLAN
1 in this case) in addition to tagged frames for VLANs 2, 3, and 4. Enabling the PVST+ support
ensures that the port is ready to send and receive PVST+ BPDUs. If you do not manually enable
PVST+ support, the support is not enabled until the port receives a PVST+ BPDU.
The configuration leaves the default VLAN and the port Port Native VLAN unchanged. The default
VLAN is 1 and the port Port Native VLAN also is 1. The dual-mode feature supports untagged
frames on the default VLAN only. Thus, port 1/1 can send and receive untagged BPDUs for VLAN 1
and can send and receive tagged BPDUs for the other VLANs.
Port 1/1 will process BPDUs as follows:
•
•
•
Untagged port using VLAN 2 as port native VLAN
Figure 55
uses tagged frames and VLAN 2 uses untagged frames.
FIGURE 55
To implement this configuration, enter the following commands.
Commands on the Dell PowerConnect Device
PowerConnect(config)#default-vlan-id 4000
PowerConnect(config)#vlan 1
PowerConnect(config-vlan-1)#tagged ethernet 1/1
PowerConnect(config-vlan-1)#exit
PowerConnect(config)#vlan 2
PowerConnect(config-vlan-2)#tagged ethernet 1/1
PowerConnect(config-vlan-2)#exit
PowerConnect(config)#interface ethernet 1/1
PowerConnect(config-if-1/1)#dual-mode 2
PowerConnect(config-if-1/1)#pvst-mode
PowerConnect(config-if-1/1)#exit
280
Process IEEE 802.1Q BPDUs for VLAN 1.
Process tagged PVST BPDUs for VLANs 2, 3, and 4.
Drop untagged PVST BPDUs for VLAN 1.
shows an example in which a port Port Native VLAN is not VLAN 1. In this case, VLAN 1
Port Native VLAN 2 for Untagged BPDUs
Untagged IEEE BPDU for VLAN 1
Tagged PVST BPDU for VLAN 1
Untagged PVST BPDUs for VLAN 2
Port1/1
Another
device
Port3/2
PowerConnect B-Series FCX Configuration Guide
53-1002266-01